Abstract

Polyclonal antibodies raised against a synthetic peptide consisting of the last 19 amino acids at the end of the coiled-coil region of the heavy chains inhibited the actin-activated Mg 2+-ATPase activity of myosin II and its ability to form filaments. Antibodies against a synthetic peptide corresponding to the 21 adjacent amino acids at the beginning of the non-helical tailpiece, which include the three regulatory phosphorylatable serines, had no effect on either activity.

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